z-index to order divs doesn't work as expected

[Evly]

I have this page: http://quaaoutlodge.com/drupal-7.14/?q=specials_events no, if you however over Book now, the div to enter the booking details appears but the submit button stays behind the div with the content even tho I set the "fade" dive's z-index to 99. Why is that?Thank you,Ron